EP3373464B1 - Method and device for transmitting reference signal in communication system - Google Patents

Method and device for transmitting reference signal in communication system Download PDF

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Publication number
EP3373464B1
EP3373464B1 EP16862490.6A EP16862490A EP3373464B1 EP 3373464 B1 EP3373464 B1 EP 3373464B1 EP 16862490 A EP16862490 A EP 16862490A EP 3373464 B1 EP3373464 B1 EP 3373464B1
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EP
European Patent Office
Prior art keywords
csi
information
enb
reference signal
ports
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German (de)
English (en)
French (fr)
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EP3373464A4 (en
EP3373464A1 (en
Inventor
Hoon-Dong Noh
Youn-Sun Kim
Young-Woo Kwak
Cheol-Kyu SHIN
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0465—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems

Definitions

  • the present disclosure relates to a method and device for transmitting a reference signal in a communication system, and more particularly, to a method and device for transmitting a reference signal using uniform power boosting in a mobile system that uses a plurality of array antennas.
  • the 5G communication system or the pre-5G communication system is called a beyond-4G-network communication system or a post-LTE system.
  • a super-high frequency (mmWave) band e.g., 60 GHz band
  • mmWave e.g., 60 GHz band
  • Beamforming, massive Multi-Input Multi-Output (MIMO), Full Dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, and large-scale antenna technologies are being discussed to mitigate propagation path loss in the super-high frequency band and to increase propagation transmission distance in the 5G communication system.
  • the 5G communication system results in the development of technologies, such as an evolved small cell, an advanced small cell, a cloud Radio Access Network (RAN), an ultra-dense network, Device to Device communication (D2D), a wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), and received interference cancellation, so as to improve the system network.
  • technologies such as an evolved small cell, an advanced small cell, a cloud Radio Access Network (RAN), an ultra-dense network, Device to Device communication (D2D), a wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), and received interference cancellation, so as to improve the system network.
  • technologies such as an evolved small cell, an advanced small cell, a cloud Radio Access Network (RAN), an ultra-dense network, Device to Device communication (D2D), a wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), and received interference cancellation, so as to improve the system network.
  • RAN Radio Access Network
  • FQAM Hybrid FSK and QAM Modulation
  • SWSC Sliding Window Superposition Coding
  • ACM Advanced Coding Modulation
  • FBMC Filter Bank Multi Carrier
  • NOMA Non Orthogonal Multiple Access
  • SCMA Sparse Code Multiple Access
  • IoT Internet of Things
  • IoE Internet of Everything
  • an intelligent Internet Technology (IT) service to create new values for peoples' lives may be provided.
  • the IoT may be applied to fields such as a smart home, a smart building, a smart city, a smart car or connected car, a smart grid, healthcare, smart home appliance, or a high-tech medical service, via the convergence of the conventional Information Technology (IT) and various industries.
  • IT Information Technology
  • 5G communication technologies such as a sensor network, M2M communication, MTC technology, and the like are implemented by the schemes such as beamforming, MIMO, array antenna, and the like.
  • the application of a cloud RAN as the big data processing technology described above may be an example of convergence of the 5G technology and the IoT technology.
  • the current mobile communication system has been developed into a high-speed and high-quality wireless packet data communication system, so as to provide a huge-capacity data service and a multimedia service, beyond the voice-based service of the earlier era.
  • various standardization organizations such as 3GPP, IEEE, and the like, have standardized the 3rd generation evolved mobile communication system to which a multi-carrier based multiple access scheme is applied. Therefore, various mobile communication standards such as Long Term Evolution Advanced (LTE-A) of 3GPP, 802.16m of IEEE, and the like, have been developed based on the multi-carrier multiple access scheme, so as to support the high-speed and high-quality wireless packet data transmission service.
  • LTE-A Long Term Evolution Advanced
  • the currently existing 4 th evolved mobile communication system such as, LTE-A, 802.16m, and the like, is based on the multi-carrier multi-access scheme.
  • the system uses various technologies, such as, Multiple Input Multiple Output (MIMO, multiple antennas), beam-forming, Adaptive Modulation and Coding (AMC), channel sensitive scheduling, and the like.
  • MIMO Multiple Input Multiple Output
  • AMC Adaptive Modulation and Coding
  • the above-described various technologies may use a method that concentrates transmission power transmitted from various antennas, controls the amount of data to be transmitted, selectively transmits data to a user who has a good channel quality, and the like, using various types of Channel Status Indications (CSIs), whereby the transmission efficiency may be improved and the system throughput may be increased.
  • CSIs Channel Status Indications
  • eNB evolved NodeB
  • UE User Equipment
  • MS Mobile Station
  • CSI-RS Channel Status Indication Reference Signal
  • the above-described eNB is a downlink transmitter and uplink receiver located in a predetermined place.
  • a single eNB may execute transmission and reception with respect to a plurality of cells.
  • a plurality of eNBs are geographically distributed and each eNB may perform transmission and reception with respect to a plurality of cells.
  • the existing 3G and 4G mobile communication systems utilize the MIMO technology that executes transmission using a plurality of transmitting and receiving antennas to increase the data transmission rate and the system throughput.
  • the MIMO technology performs transmission in a manner that spatially separates a plurality of information streams using a plurality of transmission/reception antennas.
  • the transmission by spatially dividing the plurality of information streams is referred to as spatial multiplexing.
  • the number of information streams to which spatial multiplexing is applicable may be defined as a rank of a corresponding transmission, and the rank may vary based on the number of antennas of a transmitter and a receiver.
  • spatial multiplexing for the cases in which the number of transmission/reception antennas are 2, 4, and 8, respectively, are supported, and a rank is supported up to 8.
  • US 2015/0155992 A1 discloses a method for transmitting a Channel State Information-Reference Signal (CSI-RS) from a base station supporting multiple transmit antennas to a mobile station, including the steps of: transmitting, at the base station, information of one or more CSI-RS configurations to the mobile station; and transmitting, at the base station, at least one downlink subframe mapped with the CSI-RSs to the mobile station.
  • CSI-RS Channel State Information-Reference Signal
  • the one or more CSI-RS configurations include i) at least one CSI-RS configuration for which the mobile station assumes non-zero transmission power for the CSI-RS, ii) at least one CSI-RS configuration for which the mobile station assumes zero transmission power for the CSI-RS, or iii) at least one CSI-RS configuration for which the mobile station assumes non-zero transmission power for the CSI-RS and at least one CSI-RS configuration for which the mobile station assumes zero transmission power for the CSI-RS.
  • US 2013/0182594 A1 discloses a method for generation of channel state information in a wireless communication system, including the steps of: transmitting, by an evolved Node B (eNB), a first reference signal to a plurality of User Equipments (UEs); receiving channel state information generated based on the first reference signal from the plurality of UEs; selecting candidate UEs to which wireless resources are to be allocated and transmitting second reference signals to the selected candidate UEs; receiving channel state information generated based on the second reference signals from the candidate UEs; selecting final UEs, to which wireless resources are to be allocated, from the candidate UEs based on the channel state information generated based on the second reference signals; and transmitting control information for data reception to the selected final UEs.
  • eNB evolved Node B
  • UEs User Equipments
  • US 2013/0329664 A1 discloses a method for transmitting/receiving channel state information for use in multi-antenna systemsm including the steps of: determining antenna ports of first and second directions based on directions of the plurality of antennas; allocating channel measurement resources for the respective antenna ports to a terminal; transmitting a feedback configuration to the terminal according to the channel measurement resources; and receiving feedback information from the terminal based on the channel measurement resource and the feedback configuration.
  • OTDOA Positioning Enhancements (3GPP TSG-RAN WG1 Meeting #80bis ) discusses potential enhancements to OTDOA positioning technology, including the randomization of PRS frequency bin (vshift); enhanced PRS configuration options; Terrestrial Beacon System (TBS); and PRS sequence generator initialization.
  • US 2013/0051240 A1 discloses a method of wireless communication, including the steps of: selecting a common reference signal (CRS) virtualization scheme to match a number of CRS antenna ports at a remote radio head and a number of CRS antenna ports at a macro eNodeB, wherein the selected CRS is then transmitted using the virtualization scheme.
  • CRS common reference signal
  • a method and a device for transmitting a reference signal in a communication system are provided.
  • a method and a device for applying uniform power boosting when transmitting a reference signal in a communication system that uses massive multiple antennas are provided.
  • a method and a device for using, for resource allocation of a reference signal, a resource to which zero power is allocated for applying uniform power boosting when transmitting a reference signal are provided.
  • a method and a device for applying adaptive power boosting according to a channel environment of a user equipment are provided.
  • a method of receiving channel feedback information by an evolved node B (eNB) in a communication system using at least eight antenna ports comprising: generating reference signal configuration information comprising power boosting information of reference signals allocated to the at least eight antenna ports; transmitting the reference signal configuration information to a user equipment (UE); transmitting the reference signals to the UE; and receiving channel feedback information on a channel state estimated based on the reference signal configuration information from the UE, wherein the power boosting information comprises a resource location at which a reference signal, to which zero power is allocated, is configured, wherein the power boosting information comprises information on a resource location at which a power level is applied, and, wherein the power level is adaptively controlled based on a location of the UE to which the reference signals are transmitted.
  • eNB evolved node B
  • a method of transmitting channel feedback information by a user equipment (UE) in a communication system using at least eight antenna ports comprising: receiving reference signal configuration information comprising power boosting information of reference signals allocated to the at least eight antenna ports from an evolved node B (eNB); receiving the reference signals from the eNB; generating channel feedback information on a channel state estimated based on the reference signal configuration information; and transmitting the channel feedback information to the eNB, wherein the power boosting information comprises a resource location at which a reference signal, to which zero power is allocated, is configured, wherein the power boosting information comprises information on a resource location at which a power level is applied, and wherein the power level is adaptively controlled based on a location of the UE to which the reference signals are transmitted.
  • eNB evolved node B
  • an evolved node B for transmitting a reference signal in a communication system using at least eight antenna ports
  • the eNB comprising: a transceiver; and a controller coupled with the transceiver and configured to: generate reference signal configuration information comprising power boosting information of reference signals allocated to the at least eight antenna ports; transmit the reference signal configuration information to a user equipment (UE); transmit the reference signals to the UE; and receive channel feedback information on a channel state estimated based on the reference signal configuration information from the UE, wherein the power boosting information comprises a resource location at which a reference signal, to which zero power is allocated, is configured, wherein the power boosting information comprises information on a resource location at which a power level is applied, and, wherein the power level is adaptively controlled based on a location of the UE to which the reference signals are transmitted.
  • a user equipment (UE) for transmitting channel feedback information to an evolved node B (eNB) in a communication system using at least eight antenna ports comprising: receive reference signal configuration information comprising power boosting information of reference signals allocated to the at least eight antenna ports from the eNB; receive the reference signals from the eNB; generate channel feedback information on a channel state estimated based on the reference signal configuration information; and transmit the channel feedback information to the eNB, wherein the power boosting information comprises a resource location at which a reference signal, to which zero power is allocated, is configured, wherein the power boosting information comprises information on a resource location at which a power level is applied, and wherein the power level is adaptively controlled based on a location of the UE to which the reference signals are transmitted.
  • the terms “include”, “comprise”, and derivatives thereof may mean inclusion without limitation, the term “or” may have an inclusive meaning and means “and/or”, the phrases “associated with”, “associated therewith”, and derivatives thereof may mean to include, be included within, interconnect with, contain, be contained within, connected to or with, coupled to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, and have a property of, the term “controller” may mean any device, system, or a part thereof that controls at least one operation, and such a device may be implemented in hardware, firmware, or software, or some combinations of at least two of the same.
  • a “component surface” includes one or more component surfaces.
  • first, second, etc. can be used for describing various elements, the structural elements are not restricted by the terms. The terms are used merely for the purpose to distinguish an element from the other elements. For example, a first element could be termed a second element, and similarly, a second element could be also termed a first element without departing from the scope of the present disclosure.
  • the term "and/or" includes any and all combinations of one or more associated items.
  • Embodiments of the present disclosure will be described in detail from the perspective of an Orthogonal Frequency Division Multiplexing (OFDM)-based wireless communication system, particularly, 3GPP Evolved Universal Terrestrial Radio Access (EUTRA) standard.
  • OFDM Orthogonal Frequency Division Multiplexing
  • EUTRA 3GPP Evolved Universal Terrestrial Radio Access
  • the subject matter of the present disclosure can be slightly modified within a scope not departing from the scope of the present disclosure and can be applied to other communication systems having similar technical backgrounds and channel forms, which are executed based on the decision made by those skilled in the field of the present disclosure.
  • the present disclosure relates to a method and a device for configuring a reference signal for uniform power boosting by a plurality of eNBs that use a plurality of active array antennas in a wireless communication system to which multi-carrier multiple access scheme is applied, such as OFDMA or the like.
  • the present disclosure relates to a method in which a User Equipment (UE) measures a radio channel status (channel quality) with respect to a reference signal received from the eNB, generates feedback information to report the measurement result to the eNB, and reports the feedback information.
  • UE User Equipment
  • FIG. 1 is a diagram illustrating an example of a massive MIMO system to which an embodiment of the present disclosure is applied.
  • transmission equipment 101 of an eNB transmits a radio signal using dozens or more of transmission antennas.
  • the plurality of transmission antennas included in the transmission equipment 101 may be disposed to maintain a predetermined distance therebetween.
  • the predetermined distance may correspond to a multiple of a half wavelength of a transmitted radio signal.
  • a signal transmitted from each transmission antenna may be affected by a radio channel having a low correlation. As the distance between the transmission antennas increases, the correlation between signals may decrease.
  • the transmission equipment of the eNB which has a massive antenna, may arrange the antennas in two dimensions as shown in FIG.
  • the eNB may transmit a signal using NH antennas arranged in the horizontal axis and NV antennas which are arranged in the vertical axis, and a UE 103 may measure a channel 102 for each of the transmission antennas included in the transmission equipment 101.
  • the dozens or more transmission antennas disposed in the transmission equipment 101 may be utilized for transmitting a signal to one UE or a plurality of UEs.
  • the eNB may apply an appropriate precoding to the plurality of transmission antennas, so as to transmit a signal to a plurality of UEs in parallel.
  • a single UE may receive one or more information streams.
  • the number of information streams that a single UE may receive may be determined based on the number of reception antennas that the UE contains, as well as a channel status.
  • a UE may need to accurately measure a channel status and the magnitude of interference between transmission/reception antennas using a plurality of received reference signals, and may need to transmit, to an eNB, channel status information based on measurement results.
  • the eNB that receives the channel status information of the corresponding UE may perform scheduling associated with downlink transmission using the same. Specific examples of scheduling may include a procedure of selecting UEs to which transmission is performed by an eNB, a procedure of setting a transmission speed when an eNB transmits data, a procedure of determining a precoding to be applied when data is transmitted, and the like.
  • the FD-MIMO system has a large number of transmission antennas and, thus, when the channel status information transmission/reception method of the conventional LTE/LTE-A system is applied, a large amount of control information needs to be transmitted in an uplink, which may cause an uplink overhead.
  • time, frequency, and power resources are limited in a wireless communication system. Therefore, as the amount of resources allocated to a reference signal increases, the amount of resources that may be allocated to a traffic channel for transmitting data decreases, whereby the absolute amount of data that may be transmitted may also decrease. Therefore, as the amount of resources allocated to a reference signal increases, the performance of channel measurement and estimation thereof may be improved, but the absolute amount of data transmitted decreases, whereby the throughput of the whole system may rather deteriorate.
  • resources for a reference signal and resources for traffic channel transmission need to be appropriately distributed.
  • FIG. 2 is a diagram illustrating an example of a radio resource corresponding to one subframe and one Resource Block (RB), which are the minimum units for downlink scheduling in an LTE/LTE-A system to which an embodiment of the present disclosure is applied.
  • RB Resource Block
  • the radio resources may be configured based on a subframe unit in the time axis, and a Resource Block (RB) unit in the frequency axis.
  • RB Resource Block
  • Such radio resource may include 12 subcarriers in the frequency domain, and 14 OFDM symbols in the time domain, whereby a total of 168 unique frequency-and-time positions.
  • each unique frequency-and-time position illustrated in FIG. 2 is referred to as a Resource Element (RE).
  • RE Resource Element
  • the following several different types of signals may be transmitted in the radio resource illustrated in FIG. 2 .
  • the LTE-A system may set muting, except for the above-described signals, so as to prevent a CSI-RS transmitted from another eNB from being received as interference by UEs in the corresponding cell. Muting may be applied to a location where the CSI-RS may be transmitted, and generally, a UE may skip the corresponding radio resources and receive a traffic signal. In the LTE-A system, muting is also referred to as zero-power CSI-RS. In other words, at the location of a CSI-RS to which muting is applied, transmission power may not be transmitted.
  • a CSI-RS expressed as a broken-line box may be transmitted using some of the locations expressed as A, B, C, D, E, E, F, G, H, I, and J, based on the number of antennas that transmit a CSI-RS. Also, muting may be applied to some of the locations expressed as A, B, C, D, E, E, F, G, H, I, and J. Particularly, a CSI-RS may be transmitted via 2, 4, and 8 REs, based on the number of antenna ports (APs) that execute transmission. Referring to FIG. 2 , when the number of APs is 2, a CSI-RS is transmitted via half of a predetermined pattern.
  • a CSI-RS is transmitted via the whole of the predetermined pattern.
  • a CSI-RS is transmitted using two patterns.
  • muting is always executed based on a single pattern. That is, muting may be applied to a plurality of patterns but may not be applied to some of a single pattern when the location does not overlap a CSI-RS. However, when the location of muting and the location of a CSI-RS overlap, muting may be applied to some of a single pattern.
  • a signal of each AP may be transmitted in two REs which are connected in the time axis, and the signal of each AP may be distinguished based on an orthogonal code. This indicates that two CSI-RS ports are multiplexed according to CDM-2.
  • a CSI-RS for four APs is transmitted, two more REs may be used to transmit signals of two other APs in the same manner, in addition to the CSI-RS for two APs.
  • a RE pair which is multiplexed according to CDM-2 is located in the same OFDM symbol, and is multiplexed according to FDM.
  • two RE pairs which are multiplexed according to CDM-2 are multiplexed according to FDM.
  • An eNB may boost transmission power of a CSI-RS in order to improve channel estimation accuracy.
  • a predetermined CSI-RS port may be transmitted in a CSI-RS RE located in a predetermined position, and may not be transmitted in an OFDM symbol other than the same OFDM symbol.
  • FIG. 3 is a diagram illustrating an example of CSI-RS RE mapping in n th and n+1 th Physical Resource Blocks (PRBs) when an eNB transmits eight CSI-RSs in an LTE/LTE-A system to which the present disclosure is applicable.
  • PRBs Physical Resource Blocks
  • AP #15 or #16, and APs #17 to #22 are all allocated to the same OFDM symbol.
  • the CSI-RS RE position for AP #15 or #16 is the same as a checked pattern of FIG. 3
  • the CSI-RS REs for the remaining AP #17 to #22, which are expressed by an oblique pattern may not use the transmission power of AP #15 or #16. Therefore, as illustrated in FIG.
  • AP#15 or #16 may use transmission power, which is to be used for 3 rd , 8 th , and 9 th subcarriers to which APs# 17 to #22 are allocated, for a subcarrier allocated to AP#15 or #16, that is, subcarrier #2, wherein the APs# 17 to #22 are assigned with the same OFDM symbol as those of the AP#15 or 16.
  • AP#15 or #16 may use transmission power, which is to be used for 15 th , 20 th , and 21 st subcarriers to which AP#17 to #22 are allocated, for a subcarrier allocated to AP#15 or #16, that is subcarrier#14, wherein the APs# 17 to #22 are assigned with the same OFDM symbol as the AP#15 or 16 .
  • Natural power boosting as described above may enable that the power of CSI-RS port #15 transmitted via subcarrier #2 is set to be a maximum of 6dB higher than the transmission power of AP #15 used in a data RE.
  • Current 2/4/8 port CSI-RS patterns are capable of performing natural power boosting of 0/2/6dB, respectively.
  • Each AP is capable of transmitting a CSI-RS by fully utilizing available power (full power utilization) via power boosting.
  • a UE may be assigned with a CSI-Interference Measurement (CSI-IM) or CSI-Interference Measurement Resources (CSI-IMR), together with a CSI-RS.
  • the CSI-IM resources may have the same resource structure and the same resource locations as those of a CSI-RS that supports 4 ports.
  • the CSI-IM is a resource used when a UE that receives data from one or more eNBs accurately measures interference from a neighboring eNB.
  • the UE may measure, using a CSI-IM/IMR, the amount of interference from the neighboring eNB for the case in which data is transmitted and the case in which data is not transmitted.
  • the eNB may configure a CSI-RS and two CSI-IM resources.
  • the eNB may perform configuration such that the neighboring eNB always transmits a signal using one of the two CSI-IM resources, and does not always transmit a signal using the remaining CSI-IM resource. Accordingly, the amount of interference from the neighboring eNB may be efficiently measured.
  • the eNB needs to transmit an RS to a UE so as to measure a downlink channel status.
  • a UE measures a channel status between an eNB and the UE using a CRS or a CSI-RS transmitted by the eNB.
  • CRS C-RNTI
  • CSI-RS CSI-RS transmitted by the eNB.
  • the amount of interference in a downlink may include an interference signal, a thermal noise, and the like, attributable to transmission by a transmission antenna that belongs to a neighboring eNB, which is important when a UE determines the channel status of the downlink.
  • the UE may receive a reference signal transmitted from the eNB, may determine energy that may be received per symbol in a downlink and the amount of interference that is to be received in parallel during an interval for receiving a corresponding symbol, based on the received reference signal, and may determine a ratio of symbol energy to interference (Es/Io).
  • the determined Es/Io may be converted to a data transmission speed or a value corresponding thereto, and may be reported to the eNB in the form of a Channel Quality Indicator (CQI), whereby the eNB may determine a data transmission speed in a downlink to be used for transmission to the UE.
  • CQI Channel Quality Indicator
  • the UE feeds back information associated with a channel status of a downlink to the eNB so that the eNB utilizes the same for downlink scheduling. That is, the UE measures a reference signal that the eNB transmits in a downlink, and feeds back information obtained based on the measured reference signal to the eNB in a form defined in the LTE/LTE-A standard.
  • information that the UE feeds back briefly includes the following three types of information.
  • the RI, PMI, and CQI are interrelated.
  • a precoding matrix supported in LTE/LTE-A may be defined to be different for each rank. Therefore, although the PMI value when the RI is 1 and the PMI value when the RI is 2 are the same, the PMI values are interpreted differently. Also, it is assumed that a rank value and a PMI value reported to the eNB when the UE determines a CQI are applied by the eNB.
  • this may indicate that the UE may perform reception at a data rate corresponding to CQI_Z when a rank is RI_X and a precoding is PMI_Y.
  • the UE assumes a detailed transmission scheme to be executed by the eNB when calculating a CQI, so that the UE may reach optimal performance when the eNB actually executes transmission using the corresponding transmission scheme.
  • an eNB that has a massive antenna may need to configure an RS resource for measuring eight or more antenna channels and may perform transmission to a UE.
  • a maximum of 48 REs may be used as an available CSI-RS resource.
  • the current system may configure a maximum of eight CSI-RSs for each cell. Therefore, in order to support a FD-MIMO system that operates based on eight or more CSI-RS ports, a new CSI-RS configuration method is required.
  • CSI-RSs are essential.
  • various numbers of CSI-RSs may be configured using previously defined one CSI-RS port pattern or a combination of previously defined 2, 4, or 8 CSI-RS port pattern.
  • the same CSI-RS power boosting may be applied for each AP so as to accurately estimate a channel.
  • the present disclosure will suggest a method and a device for allocating a resource for accurate channel measurement in a wireless communication system that uses a massive antenna and for transmitting the allocated resource to a UE, whereby more accurate channel status information is generated and reported.
  • a method and a device for allocating a resource for accurate channel measurement in a wireless communication system that uses a massive antenna and for transmitting the allocated resource to a UE, whereby more accurate channel status information is generated and reported.
  • an embodiment of the present disclosure will be described from the perspective of a FD-MIMO system based on LTE-A, but the embodiment of the present disclosure may not be limited to the corresponding system.
  • a zero-power (ZP) CSI-RS may be used for power boosting of a non-zero power (NZP) CSI-RS, whereby the same CSI-RS power boosting may be applied for each AP.
  • ZP zero-power
  • NZP non-zero power
  • the embodiment of the present disclosure may provide a method and a device for applying the same power boosting to all CSI-RS ports irrespective of a method of configuring a NZP CSI-RS, by reporting, by an eNB, zero-power (ZP) CSI-RS configuration information together when the eNB reports configuration information of a plurality of non-zero power (NZP) CSI-RSs to a UE in a FD-MIMO system.
  • ZP zero-power
  • the eNB includes eight or more antennas, configures an RS resource to be used for the corresponding UE to measure channels for the eight or more antennas of the eNB, and transmit information associated with the configured RS resource to the UE.
  • the number of RSs transmitted by the eNB may vary based on an antenna configuration and measurement type of the eNB.
  • FIG. 4 is a diagram illustrating an example of a CSI-RS configuration according to an antenna configuration and measurement type in a massive MIMO system.
  • diagram 401 indicates the number of CSI-RSs for full measurement that estimates CSI-RS ports for all transceiver units (TXRUs) used for data transmission of an eNB.
  • TXRUs transceiver units
  • various numbers of CSI-RSs may be transmitted depending on the number of ports of the eNB in the horizontal direction, the number of ports in the vertical direction, and whether a polarization antenna is applied to a corresponding AP.
  • the polarization antenna is applied to a corresponding AP
  • two polarization APs may be applied to one AP.
  • the number of ports in the horizontal direction is 2 and the number of ports in the vertical direction is 3.
  • the UE When a polarization antenna is not applied to all of six APs (co-polarization, Upol), the UE receives a CSI-RS only via six APs. Accordingly, the UE is configured such that channel estimation is executed six times.
  • a polarization antenna is applied to the APs (cross-polarization, Xpol)
  • the UE receives a CSI-RS via polarization APs, wherein two polarization APs are applied for each of the six APs. Accordingly, the UE is configured such that channel estimation is executed a total of 12 times.
  • the UE when a polarization antenna is not applied to the total APs, the UE may be configured to perform channel estimation a number of times corresponding to the total number of APs. When a polarization antenna is applied, the UE may be configured to perform channel estimation a number of times that is double the total number of APs.
  • Diagram 402 indicates the number of CSI-RSs for partial measurement that estimates CSI-RS ports for some TXRUs from among the TXRUs used for data transmission.
  • all TXRUs may be configured to include a TX-RU 403 to which a CSI-RS is allocated and a TX-RU 404 to which a CSI-RS is not allocated.
  • Diagram 402 has been described as an example of CSI-RS puncturing, but a pattern in which channel estimation is omitted may not be limited to diagram 402.
  • diagram 402 channel estimation for some TX-RUs may have an estimation error higher than that of channel estimation for all TX-RUs. However, the amount of the CSI-RS resource may be significantly reduced.
  • Diagram 405 illustrates the case in which the number of ports in the horizontal direction is 3 and the number of ports in the vertical direction is 3. Also, diagram 405 indicates the case in which the CSI-RS resource is allocated to 5 APs from among a total of 9 APs. Accordingly, when a UE performs partial channel estimation using a total of 5 CSI-RSs, the UE may determine channel direction information in the horizontal direction using three horizontal direction ports from among the APs to which the CSI-RS resource is allocated, and may determine channel direction information in the vertical direction using three vertical direction ports.
  • the UE When a polarization antenna is applied to partial estimation as shown in diagram 402, the UE may be configured to perform channel estimation a number of times that is double the number of some APs to which the CSI-RS resource is allocated.
  • the UE may be configured to perform channel estimation a number of times that is double the number of some APs to which the CSI-RS resource is allocated.
  • a large-scale array and a polarization antenna are used as shown in diagram 406
  • it is recognized that a large number of CSI-RSs are allocated although channel estimation is performed for some of the whole APs.
  • the embodiment of the present disclosure suggests a new CSI-RS configuration method for supporting the FD-MIMO system by taking into consideration the maximum number of CSI-RSs (8 CSI-RSs) allowed for each eNB.
  • the embodiment of the present disclosure may set a single CSI process including a plurality of CSI-RS configurations for configuring eight or more CSI-RSs.
  • FIG. 5 is a diagram illustrating an example of performing channel estimation with respect to eight or more CSI-RS ports, and generating and reporting feedback information, based on a single CSI process including a plurality of CSI-RS configurations according to an embodiment of the present disclosure.
  • a base station 500 may configure a CSI process to include eight or more CSI-RS ports, as an example of a plurality of CSI-RS ports, and may generate CSI-RS configuration information including the configuration information thereof.
  • the CSI-RS configuration information may include the RE positions of the configured CSI-RS ports, a configuration pattern of the CSI-RS ports, information related to an existing CSI-RS group, and the like.
  • the information related to the existing CSI-RS group may further include ZP CSI-RS configuration information that is configured in association with NZP CSI-RS configuration, so as to apply uniform CSI-RS power boosting, which will be described with reference to FIGs. 7a and 7b to FIG. 10 .
  • the eNB 500 transmits the CSI-RS configuration information to a UE 502.
  • the UE 502 generates feedback information, such as an RI, a PMI, a CQI, and the like, based on the CSI-RS configuration information and feedback configuration information received in advance from the eNB 500 in operation 508, and may report the same to the eNB 500 in operation 510.
  • the eNB 500 may configure, based on the feedback information, the rank and direction associated with a channel using one or more RIs and PMIs according to a predetermined rule.
  • the channel quality may be configured with multiple CQIs.
  • a plurality of CSI-RSs are directly connected to one piece of feedback configuration information and, thus, channel quality may be configured with one CQI without newly defining a joint CQI.
  • eight or more CSI-RS ports may be configured by combining a plurality of CSI-RS configurations. That is, one 16-port CSI-RS pattern may be configured by combining 2, 4, or 8 port CSI-RS patterns.
  • FIG. 6 is a diagram illustrating an example of a method of configuring eight or more CSI-RS ports by combining a plurality of CSI-RS configurations in an LTE/LTE-A system to which the present disclosure is applicable.
  • diagram 601 and diagram 602 indicate the case in which a 8-port CSI-RS pattern is configured using, for example, combinations of 4-port CSI-RS patterns.
  • the present disclosure may configure a plurality of port CSI-RS patterns, for example, a 8-port CSI-RS pattern, a 16-port CSI-RS pattern, or the like using combinations of 2 or 4-port CSI-RS pattern.
  • CSI-RS ports # 15 to 22 are located in 5 th and 6 th OFDM symbols of slot #0. That is, the CSI-RS ports # 15 to 16 and #19 to 20 and the CSI-RS ports #17 to 18 and #21 to 22, which are located in the 5 th and 6 th OFDM symbols of slot #0, are located in different subcarriers.
  • the CSI-RS ports #15 to 16 and #19 to 20 may use the power to be used by the CSI-RS ports #17 to 18 and #21 to 22 which are located at the same OFDM symbols, or the CSI-RS ports #17 to 18 and #21 to 22 may use the power to be used by the CSI-RS ports #15 to 16 and #19 to 20 which are located at the same OFDM symbols, whereby 6dB natural power boosting may be applied when CSI-RS transmission to a UE is performed.
  • CSI-RS ports # 23 to 30 are located in 2 nd and 3 rd OFDM symbols of slot #1. That is, the CSI-RS ports # 23 to 24 and #27 to 28 and the CSI-RS ports #25 to 26 and #29 to 30, which are located in the 2 nd and 3 rd OFDM symbols of slot #1, are located in different subcarriers.
  • the CSI-RS ports #23 to 24 and #27 to 28 may use the power to be used by the CSI-RS ports #25 to 26 and #29 to 30 which are located in the same OFDM symbols, or the CSI-RS ports #25 to 26 and #29 to 30 may use the power to be used by the CSI-RS ports #23 to 24 and #27 to 28 which are located in the same OFDM symbols, whereby 6dB natural power boosting may be applied when CSI-RS transmission to a UE is performed.
  • all CSI-RS ports are transmitted at uniform power and, thus, channel estimation performance may not deteriorate by a predetermined port.
  • FIGs. 7a and 7b are diagrams illustrating another example of a method of configuring eight or more CSI-RS ports by combining a plurality of CSI-RS configurations in an LTE/LTE-A system to which the present disclosure is applicable.
  • a port CSI-RS pattern may be configured by combining different port CSI-RS patterns.
  • diagram 701 and diagram 703 illustrate a 8-port CSI-RS pattern configured by combining 4-port CSI-RS patterns.
  • various 8-port CSI-RS patterns and 16-port CSI-RS patterns may be configured using 2 or 4-port CSI-RS pattern.
  • CSI-RS ports # 15 to 22 are located in 5 th and 6 th OFDM symbols of slot #0. That is, the CSI-RS ports # 15 to 16 and #19 to 20 and the CSI-RS ports #17 to 18 and #21 to 22 are located in different subcarriers.
  • the CSI-RS ports #15 to 16 and #19 to 20 may use the power to be used by the CSI-RS ports #17 to 18 and #21 to 22 which are located in the same OFDM symbols, or the CSI-RS ports #17 to 18 and #21 to 22 may use the power to be used by the CSI-RS ports #15 to 16 and #19 to 20 which are located in the same OFDM symbols, whereby 6dB natural power boosting may be applied when CSI-RS transmission to a UE is performed.
  • CSI-RS ports # 23 to 26 are located in 2 nd and 3 rd OFDM symbols of slot #1. That is, the CSI-RS ports # 23 to 24 and the CSI-RS ports #25 to 26 are located in different subcarriers. In this instance, the CSI-RS ports # 23 to 24 may use the power to be used by the CSI-RS ports # 25 and 26 located in the same OFDM symbols, or the CSI-RS ports #25 and 26 may use the power to be used by the CSI-RS ports # 23 and 24, whereby a maximum of 3dB natural power boosting may be applied when CSI-RS transmission to a UE is performed. As illustrated in FIG. 7a , when a difference in power boosting exists between CSI-RS ports, the overall channel estimation performance may be limited by a CSI-RS port having low transmission power.
  • CSI-RS ports # 15 to 22 are located in 5 th and 6 th OFDM symbols of slot #0. That is, CSI-RS ports # 15 to 16 and #19 to 20 and CSI-RS ports #17 to 18 and #21 to 22 are located in different subcarriers.
  • the CSI-RS ports #15 to 16 and #19 to 20 may use the power to be used by the CSI-RS ports #17 to 18 and #21 to 22 which are located in the same OFDM symbols, or the CSI-RS ports #17 to 18 and #21 to 22 may use the power to be used by the CSI-RS ports #15 to 16 and #19 to 20 which are located in the same OFDM symbols, whereby 6dB natural power boosting may be applied when CSI-RS transmission to a UE is performed.
  • CSI-RS ports # 23 to 24 are located in 2 nd and 3 rd OFDM symbols of slot #1. In this instance, except for the CSI-RS ports # 23 and 24, CSI-RS ports to which a different subcarrier is mapped do not exist in the 2 nd and 3 rd OFDM symbols of slot #1. In the same manner, in diagram 705, CSI-RS ports # 25 and 26 are located in 5 th and 6 th OFDM symbols of slot #1. In this instance, except for the CSI-RS ports #25 and 26, CSI-RS ports to which a different subcarrier is mapped do not exist in the 5 th and 6 th OFDM symbols of slot #1. Therefore, in diagrams 704 and 705, natural power boosting may not be applicable.
  • the CSI-RS ports #23 to 26 in diagrams 704 and 705 may be incapable of obtaining a channel estimation performance gain via power boosting and, thus, the overall channel estimation performance may be limited by the ports in diagrams 704 and 705 where natural power boosting is not applicable.
  • An eNB may define a ratio of a CSI-RS Energy per RE (CSI-RS EPRE) to a PDSCH EPRE as Pc, for a UE to calculate a CQI, and may report Pc to the UE.
  • Pc is calculated by assuming that transmission power of all CSI-RS ports are the same. In this instance, in the case in which unbalanced power boosting is applied as shown in FIG. 7 , a different Pc value needs to be configured for each CSI-RS port or CSI-RS port transmission power boosting needs to be limited based on Pc having a lower value, to enable the UE to accurately calculate a CQI.
  • an embodiment of the present disclosure will suggest a method of performing NZP CSI-RS configuration using a ZP CSI-RS configuration, so as to apply uniform CSI-RS power boosting.
  • an eNB according to the embodiment of the present disclosure set an OFDM symbol including the largest number of CSI-RS ports as a reference, and may configure a ZP CSI-RS for performing CSI-RS power boosting corresponding to CSI-RS power boosting applicable to the OFDM symbol that is set as the reference.
  • the eNB may further configure a ZP CSI-RS for an OFDM symbol including a smaller number of NZP CSI-RSs, from among OFDM symbols via which an NZP CSI-RS is transmitted.
  • the eNB may not transmit a CSI-RS via the added ZP CSI-RS RE and, thus, may use the power to be used by the ZP CSI-RS RE as needed, so as to perform power boosting in an NZP CSI-RS.
  • the magnitude of a ZP CSI-RS resource configured for CSI-RS power boosting may be determined to correspond to a power boosting level additionally required for CSI-RS power boosting applicable to the OFDM symbol set as the reference.
  • FIGs. 8a and 8b are diagrams illustrating examples of allocating a ZP CSI-RS resource for a CSI-RS power boosting according to an embodiment of the present disclosure.
  • an NZP CSI-RS resource is configured to be the same as diagram 701 and diagram 702. Accordingly, CSI-RS ports # 15 to 22 are located in 5 th and 6 th OFDM symbols of slot #0. That is, CSI-RS ports # 15 to 16 and #19 to 20 and CSI-RS ports #17 to 18 and #21 to 22 are located in different subcarriers.
  • Diagram 800 shows that CSI-RS ports #23 to 24 and #25 to 26, which are located in 2 nd and 3 rd OFDM symbols of slot #1, are located in different subcarriers.
  • the eNB may additionally configure ZP CSI-RSs for the 2 nd and 3 rd OFDM symbols of slot #1 to which APs corresponding to diagram 800 are allocated, for power boosting of the APs corresponding to diagram 800.
  • ZP CSI-RSs for the 2 nd and 3 rd OFDM symbols of slot #1 to which APs corresponding to diagram 800 are allocated, for power boosting of the APs corresponding to diagram 800.
  • 6dB natural power boosting are applicable.
  • 3dB natural power boosting is applicable as described in FIG. 7 and, thus, 3dB power boosting may be additionally required for uniform power boosting.
  • the eNB may configure ZP CSI-RSs for four ports located in different subcarriers, which respectively correspond to the CSI-RS ports # 23 and 24 and the CSI-RS ports #25 and 26 in the 2 nd and 3 rd OFDM symbols of slot #1, as shown in diagrams 801 and 802, so as to correspond to the 4-port CSI-RS pattern, which is the basic unit for ZP CSI-RS allocation.
  • the example of FIG. 8a illustrates the case in which a pattern of ports in which ZP CSI-RSs are configured and a pattern of CSI-RS ports # 23 to 26 overlap.
  • a ZP CSI-RS resource pattern that needs to be configured for uniform power boosting does not overlap a previously allocated NZP CSI-RS resource pattern
  • a ZP CSI-RS is configured using a single 4-port CSI-RS pattern and additional 3dB power boosting may be performed.
  • a NZP CSI-RS resource is configured to be the same as diagrams 703, 704, and 705 of FIG. 7 .
  • the eNB may additionally configure ZP CSI-RSs for 2 nd and 3 rd OFDM symbols and 5 th and 6 th OFDM symbols of slot #1.
  • the eNB according to the embodiment of the present disclosure may additionally configure ZP CSI-RSs for 2 nd and 3 rd OFDM symbols and 5 th and 6 th OFDM symbols of slot #1.
  • the eNB may configure ZP CSI-RSs located in different subcarriers, which respectively correspond to the CSI-RS ports # 23 and 24 in the 2 nd and 3 rd OFDM symbols of slot #1, as shown in diagrams 803 and 804, so as to correspond to the 4-port CSI-RS pattern, which is the basic unit for ZP CSI-RS allocation.
  • the eNB may configure ZP CSI-RSs located in different subcarriers, which respectively correspond to the CSI-RS ports # 25 and 26 in the 5 th and 6 th OFDM symbols of slot #1, as shown in diagrams 805 and 806, so as to correspond to the 4-port CSI-RS pattern, which is the basic unit for ZP CSI-RS allocation. Also in the example of FIG.
  • a ZP CSI-RS is configured using the 4-port CSI-RS pattern as the basic unit. Accordingly, a ZP CSI-RS may be configured by taking into consideration whether a ZP CSI-RS resource pattern that needs to be configured for uniform power boosting overlaps an NZP CSI-RS resource pattern.
  • FIG. 8a and 8b have described from the perspective of the situation in which the total number of allocable CSI-RS ports is 12.
  • the number of allocable CSI-RS ports may not be limited thereto, and various numbers such as 10, 14, ..., 64, and the like may be applicable.
  • the accuracy of channel estimation required may change according to a channel environment where a UE is located. For example, in the case of a UE located at a distance farther than a predetermined distance threshold value from an eNB, CSI-RS power boosting relatively higher than that of a UE located at a relatively short distance may be required so as to compensate pathloss. Conversely, in the case of a UE located at a distance closer than the predetermined distance threshold value from the eNB, pathloss may not be high and, thus, low-level CSI-RS power boosting may be required or CSI-RS power boosting may not be required in some instances. Therefore, the embodiment of the present disclosure may adaptively control a power boosting level according to the location of a UE. Accordingly, the eNB according to the embodiment of the present disclosure may be capable of configuring different ZP CSI-RSs according to a channel status of a UE.
  • FIGs. 9a and 9b are diagrams illustrating examples of adaptively controlling an adaptive power boosting level corresponding to the location of a UE according to an embodiment of the present disclosure.
  • a sufficient number of ZP CSI-RSs may be configured for a UE existing at a cell boundary of an eNB, so that the maximum power boosting is allowed. It is assumed that the eNB according to the embodiment of the present disclosure allocates CSI-RS ports #23 and 24 in the 2 nd and 3 rd OFDM symbol of slot #1 and CSI-RS ports #25 and 26 in the 5 th and 6 th OFDM symbols of slot #1, to the UE existing at the cell boundary.
  • the eNB may perform power boosting using the power to be used by the ZP CSI-RS resource configured as shown in diagrams 900 and 901 in the same OFDM symbols as those of the CSI-RS ports # 23 and 24 of slot #1.
  • the eNB may perform power boosting using the power to be used by the ZP CSI-RS resource configured as shown in diagrams 902 and 903 in the same OFDM symbols as those of the CSI-RS ports # 25 and 26 of slot #1.
  • CSI-RS ports #23 and 24 in the 2 nd and 3 rd OFDM symbol of slot #1 and CSI-RS ports #25 and 26 in the 5 th and 6 th OFDM symbols of slot #1 are allocated to the UE existing at the center of the cell of the eNB.
  • the eNB may perform power boosting using the power to be used by the ZP CSI-RS resource configured as shown in diagram 904 in the same OFDM symbols as those of the CSI-RS ports # 23 and 24 of slot #1.
  • the eNB may perform power boosting using the power to be used by the ZP CSI-RS resource configured as shown in diagram 905 in the same OFDM symbols as those of the CSI-RS ports # 25 and 26 of slot #1.
  • an eNB may additionally configure a ZP CSI-RS for all OFDM symbols including a CSI-RS, and may perform CSI-RS power boosting.
  • FIG. 10 is a diagram illustrating an example of additionally configuring a ZP CSI-RS for each of all NZP CSI-RS resources according to another embodiment of the present disclosure.
  • a ZP CSI-RS may be configured as shown in diagrams 1001 and 1002, for CSI-RS ports # 15 and 16, and CSI-RS ports #17 and 18 allocated to the same OFDM symbols of slot #0, according to an embodiment of the present disclosure.
  • a ZP CSI-RS may be configured, as shown in diagrams 1003 and 1004, for CSI-RS ports # 19 and 20 and CSI-RS ports #21 and 22 allocated in the same OFDM symbols of slot #1.
  • a ZP CSI-RS may be configured, as shown in diagrams 1005 and 1006, for CSI-RS ports # 23 and 24, and CSI-RS ports #25 and 26 allocated in other same OFDM symbols of slot #1.
  • 6dB power boosting is applicable with respect to all CSI-RS ports to which a maximum of 3dB natural power boosting is applicable.
  • additional power boosting of 3dB is applied using the power of the ZP CSI-RS configured as shown in diagrams 1007 and 1008, whereby a maximum of 6dB power boosting may be applied.
  • FIG. 11 is an example of a flowchart of operations of an eNB according to an embodiment of the present disclosure.
  • an eNB generates reference signal configuration information including power boosting information of reference signals in operation 1100, and the eNB transmits the configuration information to a UE in operation 1102.
  • the reference signal configuration information may include a process of configuring at least one of resource information associated with at least eight antenna ports to which reference signals are allocated, pattern information associated with the at least eight antenna ports, and the same power boosting information of the reference signals allocated to the at least eight antenna ports.
  • the reference signal configuration information including the power boosting information associated with reference signals according to the embodiment of the present disclosure are configured according to the descriptions which have been described with reference to FIGs. 8a and 8b to FIG. 10 , and, thus, descriptions thereof will be omitted.
  • the eNB transmits the reference signal and receives channel feedback information obtained based on the configuration information from the UE in operation 1104.
  • FIG. 12 is an example of a flowchart of operations of a UE according to an embodiment of the present disclosure.
  • the UE receives reference signal configuration information including power boosting information associated with reference signals from an eNB.
  • the reference signal configuration information may include a process of configuring at least one of resource information associated with at least eight antenna ports to which reference signals are allocated, pattern information associated with the at least eight antenna ports, and the same power boosting information of the reference signals allocated to the at least eight antenna ports.
  • the reference signal configuration information including the power boosting information associated with reference signals according to the embodiment of the present disclosure are configured according to the descriptions which have been described with reference to FIGs. 8a and 8b to FIG. 10 , and, thus, descriptions thereof will be omitted.
  • the UE may estimate a channel, based on the configuration information in operation 1202, and may feed the estimated channel information back to the eNB in operation 1204.
  • FIG. 13 is an example of the configuration of an eNB according to an embodiment of the present disclosure.
  • an eNB 1300 may include, for example, a controller 1302, a transceiving unit 1304, a storage unit 1306, and a reference signal configuration unit 1308.
  • the configuration of FIG. 13 is made as an example, and each element of the eNB may be configured as separate detailed elements or the elements may be configured in an integrated form according to an embodiment of the present disclosure or the intention of an operator.
  • the controller 1302 may control the overall operation of the eNB according to the embodiment of the present disclosure.
  • the reference signal configuration unit 1308 may configure reference signal configuration information including power boosting information associated with reference signals, as shown in FIGs. 8a and 8b to FIG. 10 , according to the control of the controller 1302.
  • the controller 1302 may perform control such that the transceiving unit 1304 transmits the reference signal configuration information.
  • the storage unit 1306 may store information configured by the eNB according to the embodiment of the present disclosure, or feedback information received from the UE.
  • FIG. 14 is an example of the configuration of a UE according to an embodiment of the present disclosure.
  • a UE 1400 may include, for example, a controller 1402, a transceiving unit 1404, a storage unit 1406, and a feedback information generation unit 1408.
  • the configuration of FIG. 14 is made as an example, and each element of the UE may be configured as separate detailed elements or the elements may be configured in an integrated form according to an embodiment of the present disclosure or the intention of an operator.
  • the controller 1402 may control the overall operation of the UE according to the embodiment of the present disclosure.
  • the feedback information generation unit 1408 may estimate a channel, based on the reference signal configuration information including power boosting information associated with reference signals, as shown in FIGs. 8a and 8b to FIG. 10 , and may configure feedback information associated with the estimated channel, according to the control of the controller 1402.
  • the controller 1402 may perform control such that the transceiving unit 1304 transmits the feedback information.
  • the storage unit 1306 may store feedback related information, the reference signal configuration information, or the like, received from the eNB according to the embodiment of the present disclosure.
  • the computer-readable recording medium is a predetermined data storage device which can store data which can be read by a computer system.
  • Examples of the computer readable recording medium may include a read-only memory (ROM), a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and a carrier wave (such as data transmission through the Internet).
  • the computer-readable recording medium may be distributed through computer systems connected to the network, and accordingly the computer-readable code is stored and executed in a distributed manner. Further, functional programs, codes, and code segments to achieve the present disclosure may be easily interpreted by programmers skilled in the art.
  • a method and apparatus may be implemented in the form of hardware, software, or a combination of hardware and software. Any such software may be stored, for example, in a volatile or non-volatile storage device such as a ROM, a memory such as a RAM, a memory chip, a memory device, or a memory IC, or a recordable optical or magnetic medium such as a CD, a DVD, a magnetic disk, or a magnetic tape, regardless of its ability to be erased or its ability to be re-recorded.
  • a volatile or non-volatile storage device such as a ROM, a memory such as a RAM, a memory chip, a memory device, or a memory IC, or a recordable optical or magnetic medium such as a CD, a DVD, a magnetic disk, or a magnetic tape, regardless of its ability to be erased or its ability to be re-recorded.
  • a method and apparatus according to an embodiment of the present disclosure may be implemented by a computer or portable terminal including a controller and a memory, and the memory is an example of a machine readable device adapted to store a program or programs including instructions for implementing embodiments of the present disclosure.
  • the present disclosure includes a program including a code for implementing the apparatus or method described in any of the appended claims of the specification and a machine (computer or the like) readable storage medium for storing the program.
  • the program may be electronically carried by any medium such as a communication signal transferred through a wired or wireless connection, and the present disclosure appropriately includes equivalents thereof.
  • an apparatus may receive the program from a program providing device that is wiredly or wirelessly connected thereto, and may store the program.
  • the program providing device may include a program including instructions through which a program processing device performs a preset content protecting method, a memory for storing information and the like required for the content protecting method, a communication unit for performing wired or wireless communication with the program processing device, and a controller for transmitting the corresponding program to a transceiver at the request of the program processing device or automatically.
EP16862490.6A 2015-11-06 2016-11-04 Method and device for transmitting reference signal in communication system Active EP3373464B1 (en)

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KR1020150155709A KR20170053338A (ko) 2015-11-06 2015-11-06 통신 시스템에서 기준신호를 송신하는 방법 및 장치
PCT/KR2016/012687 WO2017078475A1 (ko) 2015-11-06 2016-11-04 통신 시스템에서 기준신호를 송신하는 방법 및 장치

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WO2017078475A1 (ko) 2017-05-11
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EP3373464A4 (en) 2018-11-07
EP3373464A1 (en) 2018-09-12
US10425141B2 (en) 2019-09-24

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